Page summary

Summary

Metric	Value
Page metrics
Performance Score	60
Total Page Transfer Size	3.2 MB
Requests	130
Timing metrics
TTFB [median]	417 ms
First Paint [median]	939 ms
Fully Loaded [median]	10.501 s
Google Web Vitals
TTFB [median]	417 ms
First Contentful Paint (FCP) [median]	939 ms
Largest Contentful Paint (LCP) [median]	2.843 s
Cumulative Layout Shift (CLS) [median]	0.65
Total Blocking Time [median]	456 ms
Max Potential FID [median]	260 ms
CPU metrics
CPU long tasks [median]	3
CPU longest task duration	273 ms
CPU last long task happens at	4.214 s
Visual Metrics
First Visual Change [median]	2.866 s
Speed Index [median]	3.602 s
Visual Complete 85% [median]	4.233 s
Visual Complete 99% [median]	4.533 s
Last Visual Change [median]	4.533 s

Timings Summary

Waterfall

Run 3 SpeedIndex median

Video

Filmstrip

Use--filmstrip.showAll to show all filmstrips.

0 s

1 sDOM Content Loaded Time 961 msFirst Contentful Paint 962 ms

1.4 ssentry-tracing-init 1.394 s

2.9 sLCP <P> 2.843 sFirst Visual Change 2.866 s

3 sLayout Shift 0.00151 2.916 sLayout Shift 0.00254 2.933 s

3.1 sLayout Shift 0.00792 3.032 s

3.2 s

3.5 sLayout Shift 0.07853 3.435 sCPU Long Task duration 93 ms

3.6 sLayout Shift 0.46226 3.573 sPage Load Time 3.576 s

3.7 s

3.8 s

3.9 s

4 sCPU Long Task duration 246 ms

4.1 s

4.2 sLayout Shift 0.08359 4.197 s

4.3 sLayout Shift 0.00206 4.208 sCPU Long Task duration 259 msVisual Complete 85% 4.233 s

4.4 s

4.5 sLayout Shift 0.00040 4.476 s

4.6 sLayout Shift 0.00854 4.515 sLast Visual Change 4.566 sVisual Complete 95% 4.566 sVisual Complete 99% 4.566 s

Coach

The coach helps you find performance problems on your web page using web performance best practice rules. And gives you advice on privacy and best practices. Tested using Coach-core version 8.0.2.

Coach score

• Total score 66
• Performance score 60
• Privacy score 73
• Best practice score 72

Performance advice (60)

Show/hide details

Title	Advice	Score
Avoid slowing down the critical rendering path (avoidRenderBlocking)	The page has 4 blocking requests and 1 in body parser blocking (4 JavaScript and 1 CSS).	60
Description: The critical rendering path is what the browser needs to do to start rendering the page. Every file requested inside of the head element will postpone the rendering of the page, because the browser need to do the request. Avoid loading JavaScript synchronously inside of the head (you should not need JavaScript to render the page), request files from the same domain as the main document (to avoid DNS lookups) and inline CSS for really fast rendering and a short rendering path.
Offenders: https://www.google.com/recaptcha/api.js?render=6LcpTuUnAAAAAD6YCBdr_2-0b1AH8N6nXkYEG5G5 https://js.sentry-cdn.com/46062cbe0aeb7a3b2bb4c3a9b8cd1ac7.min.js https://www.gstatic.com/recaptcha/releases/lqsTZ5beIbCkK4uGEGv9JmUR/recaptcha__en.js https://www.gstatic.com/recaptcha/releases/lqsTZ5beIbCkK4uGEGv9JmUR/recaptcha__en.js
Don't scale images in the browser (avoidScalingImages)	The page has 4 images that are scaled more than 100 pixels. It would be better if those images are sent so the browser don't need to scale them.	60
Description: It's easy to scale images in the browser and make sure they look good in different devices, however that is bad for performance! Scaling images in the browser takes extra CPU time and will hurt performance on mobile. And the user will download extra kilobytes (sometimes megabytes) of data that could be avoided. Don't do that, make sure you create multiple version of the same image server-side and serve the appropriate one.
Offenders: https://ui.adsabs.harvard.edu/styles/img/transparent_logo.svg https://ui.adsabs.harvard.edu/styles/img/orcid-inactive.svg https://ui.adsabs.harvard.edu/styles/img/cfa.png https://ui.adsabs.harvard.edu/styles/img/nasa-partner.svg
Avoid using Google Tag Manager. (googleTagManager)	The page is using Google Tag Manager, this is a performance risk since non-tech users can add JavaScript to your page.	0
Description: Google Tag Manager makes it possible for non tech users to add scripts to your page that will downgrade performance.
Inline CSS for faster first render (inlineCss)	The page has both inline CSS and CSS requests even though it uses a HTTP/2-ish connection. If you have many users on slow connections, it can be better to only inline the CSS. Run your own tests and check the waterfall graph to see what happens.	95
Description: In the early days of the Internet, inlining CSS was one of the ugliest things you can do. That has changed if you want your page to start rendering fast for your user. Always inline the critical CSS when you use HTTP/1 and HTTP/2 (avoid doing CSS requests that block rendering) and lazy load and cache the rest of the CSS. It is a little more complicated when using HTTP/2. Does your server support HTTP push? Then maybe that can help. Do you have a lot of users on a slow connection and are serving large chunks of HTML? Then it could be better to use the inline technique, becasue some servers always prioritize HTML content over CSS so the user needs to download the HTML first, before the CSS is downloaded.
Have a fast largest contentful paint (largestContentfulPaint)	Largest contentful paint can be improved 2.862 s. It is in the Google Web Vitals needs improvement range, slower than 2.5 seconds.	80
Description: Largest contentful paint is one of Google Web Vitals and reports the render time of the largest image or text block visible within the viewport, relative to when the page first started loading. To be fast according to Google, it needs to render before 2.5 seconds and results over 4 seconds is poor performance.
Offenders: <p></p>
Avoid CPU Long Tasks (longTasks)	The page has 3 CPU long tasks with the total of 600 ms. The total blocking time is 450 ms . However the CPU Long Task is depending on the computer/phones actual CPU speed, so you should measure this on the same type of the device that your user is using. Use Geckoprofiler for Firefox or Chromes tracelog to debug your long tasks.	40
Description: Long CPU tasks locks the thread. To the user this is commonly visible as a "locked up" page where the browser is unable to respond to user input; this is a major source of bad user experience on the web today. However the CPU Long Task is depending on the computer/phones actual CPU speed, so you should measure this on the same type of the device that your user is using. To debug you should use the Chrome timeline log and drag/drop it into devtools or use Firefox Geckoprofiler.
Offenders: self self self
Avoid Frontend single point of failures (spof)	The page has 1 request inside of the head that can cause a SPOF (single point of failure). Load them asynchronously or move them outside of the document head.	90
Description: A page can be stopped from loading in the browser if a single JavaScript, CSS, and in some cases a font, couldn't be fetched or is loading really slowly (the white screen of death). That is a scenario you really want to avoid. Never load 3rd-party components synchronously inside of the head tag.
Offenders: https://www.google.com/recaptcha/api.js?render=6LcpTuUnAAAAAD6YCBdr_2-0b1AH8N6nXkYEG5G5
Avoid doing redirects (assetsRedirects)	The page has 1 redirect. 1 request are from other domains, it could be 3rd-party assets doing unnecessary redirects. :(	90
Description: A redirect is one extra step for the user to download the asset. Avoid that if you want to be fast. Redirects are even more of a showstopper on mobile.
Offenders: https://unpkg.com/web-vitals/dist/web-vitals.iife.js
Avoid extra requests by setting cache headers (cacheHeaders)	The page has 9 requests that are missing a cache time. Configure a cache time so the browser doesn't need to download them every time. It will save 184.5 kB the next access.	10
Description: The easiest way to make your page fast is to avoid doing requests to the server. Setting a cache header on your server response will tell the browser that it doesn't need to download the asset again during the configured cache time! Always try to set a cache time if the content doesn't change for every request.
Offenders: https://www.google.com/recaptcha/api2/anchor...ptcha/api2/anchor https://ui.adsabs.harvard.edu/v1/accounts/bootstrap https://ui.adsabs.harvard.edu/v1/accounts/bootstrap https://ui.adsabs.harvard.edu/v1/vault/configuration/site_wide_message https://ui.adsabs.harvard.edu/v1/search/query...u/v1/search/query https://ui.adsabs.harvard.edu/v1/search/query...u/v1/search/query https://ui.adsabs.harvard.edu/v1/search/query...u/v1/search/query https://ui.adsabs.harvard.edu/v1/search/query...u/v1/search/query https://ui.adsabs.harvard.edu/v1/search/query...u/v1/search/query
Long cache headers is good (cacheHeadersLong)	The page has 80 requests that have a shorter cache time than 30 days (but still a cache time).	20
Description: Setting a cache header is good. Setting a long cache header (at least 30 days) is even better beacause then it will stay long in the browser cache. But what do you do if that asset change? Rename it and the browser will pick up the new version.
Offenders: https://ui.adsabs.harvard.edu/styles/css/styles.css?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/libs/require.js https://ui.adsabs.harvard.edu/config/shim.js?v=v1.5.7-hotfix4 https://www.google.com/recaptcha/api.js?render=6LcpTuUnAAAAAD6YCBdr_2-0b1AH8N6nXkYEG5G5 https://js.sentry-cdn.com/46062cbe0aeb7a3b2bb4c3a9b8cd1ac7.min.js https://www.googletagmanager.com/gtm.js?id=GTM-NT2453N https://ui.adsabs.harvard.edu/config/main.config.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/config/main.bundle.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/config/search-page.config.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/config/search-page.bundle.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/config/discovery.vars.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/libs/polyfill.js?v=v1.5.7-hotfix4 https://www.googletagmanager.com/gtag/js?id=G-X07MS2584V&l=dataLayer&cx=c https://unpkg.com/web-vitals/dist/web-vitals.iife.js https://unpkg.com/web-vitals@4.2.4/dist/web-vitals.iife.js https://cdn.jsdelivr.net/npm/react@16/umd/react.production.min.js?v=v1.5.7-hotfix4 https://cdn.jsdelivr.net/npm/prop-types@15.6/prop-types.min.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/libs/sprintf.js?v=v1.5.7-hotfix4 https://www.gstatic.com/recaptcha/api2/logo_48.png https://ui.adsabs.harvard.edu/styles/img/transparent_logo.svg https://ui.adsabs.harvard.edu/styles/img/orcid-inactive.svg https://ui.adsabs.harvard.edu/styles/img/smithsonian-logo.svg https://ui.adsabs.harvard.edu/styles/img/cfa.png https://ui.adsabs.harvard.edu/styles/img/nasa-partner.svg https://ui.adsabs.harvard.edu/libs/fontawesome/fonts/fontawesome-webfont.woff2?v=4.7.0 https://ui.adsabs.harvard.edu/js/widgets/sort/widget.jsx.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/widget.jsx.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/export/widget.jsx.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/wraps/author_network.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/wraps/paper_network.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/styles/img/reads_vs_time.png https://ui.adsabs.harvard.edu/styles/img/citations_vs_time.png https://ui.adsabs.harvard.edu/styles/img/reads_vs_citations.png https://ui.adsabs.harvard.edu/js/widgets/orcid-selector/widget.jsx.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/index.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/styles/css/images/ui-bg_flat_75_ffffff_40x100.png https://ui.adsabs.harvard.edu/js/widgets/sort/redux/configure-store.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/sort/redux/modules/sort-app.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/sort/containers/sort-container.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/containers/App....ainers/App.jsx.js https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/constants/actio...ts/actionNames.js https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/actions/index.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/reducers/index.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/orcid-selector/redux/configure-store.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/orcid-selector/redux/modules/orcid-sele...d-selector-app.js https://ui.adsabs.harvard.edu/js/widgets/orcid-selector/containers/orcid-selecto...ctor-container.js https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/components/App.jsx.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/react/WithBackboneView.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/react/configureStore.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/actions.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/middleware.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/reducer.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/react/shared/helpers.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/react/shared/middleware/api.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/export/reducers/index.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/export/actions/index.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/export/containers/App.jsx.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/wraps/templates/paper-network-data.html?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/wraps/templates/paper-network-container.html?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/wraps/templates/paper-network-link-data.html?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/sort/components/sort-app.jsx.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Expo...matControl.jsx.js https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Sele...ionButtons.jsx.js https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Row....onents/Row.jsx.js https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Mess...ts/Message.jsx.js https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Load...ts/Loading.jsx.js https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Clos...nts/Closer.jsx.js https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/models/authorAf...horAffiliation.js https://ui.adsabs.harvard.edu/js/widgets/orcid-selector/components/orcid-selecto...lector-app.jsx.js https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/components/CollapsePanel.js...lapsePanel.jsx.js https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/containers/SaveQueryForm.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/export/components/Closer.jsx.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/export/components/Setup.jsx.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/export/components/Export.jsx.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Last...iveDateRow.jsx.js https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Affi...liationRow.jsx.js https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/components/SaveQueryForm.js...eQueryForm.jsx.js https://ui.adsabs.harvard.edu/js/widgets/export/components/ClipboardBtn.jsx.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/constants.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/favicon-32x32.png
Always compress text content (compressAssets)	The page has 38 requests that are served uncompressed. You could save a lot of bytes by sending them compressed instead.	0
Description: In the early days of the Internet there were browsers that didn't support compressing (gzipping) text content. They do now. Make sure you compress HTML, JSON, JavaScript, CSS and SVG. It will save bytes for the user; making the page load faster and use less bandwith.
Offenders: URL Transfer size Content size https://ui.adsabs.harvard.edu/search/q=abs%3A%22dark%20energy%22&sort=date%20des...bcode%20desc&p_=0 8.2 KB 8.0 KB https://ui.adsabs.harvard.edu/styles/css/styles.css?v=v1.5.7-hotfix4 340.7 KB 340.5 KB https://ui.adsabs.harvard.edu/libs/require.js 69.6 KB 69.3 KB https://ui.adsabs.harvard.edu/config/shim.js?v=v1.5.7-hotfix4 2.7 KB 2.7 KB https://ui.adsabs.harvard.edu/config/main.config.js?v=v1.5.7-hotfix4 16.1 KB 15.9 KB https://ui.adsabs.harvard.edu/config/main.bundle.js?v=v1.5.7-hotfix4 445.5 KB 445.2 KB https://ui.adsabs.harvard.edu/config/search-page.config.js?v=v1.5.7-hotfix4 15.8 KB 15.7 KB https://ui.adsabs.harvard.edu/config/search-page.bundle.js?v=v1.5.7-hotfix4 641.9 KB 641.5 KB https://ui.adsabs.harvard.edu/libs/polyfill.js?v=v1.5.7-hotfix4 25.0 KB 24.9 KB https://ui.adsabs.harvard.edu/libs/sprintf.js?v=v1.5.7-hotfix4 3.7 KB 3.6 KB https://ui.adsabs.harvard.edu/styles/img/transparent_logo.svg 3.4 KB 3.2 KB https://ui.adsabs.harvard.edu/styles/img/smithsonian-logo.svg 10.6 KB 10.6 KB https://ui.adsabs.harvard.edu/styles/img/nasa-partner.svg 10.1 KB 10.0 KB https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/widget.jsx.js?v=v1.5.7-hotfix4 3.2 KB 3.1 KB https://ui.adsabs.harvard.edu/js/widgets/export/widget.jsx.js?v=v1.5.7-hotfix4 4.6 KB 4.5 KB https://ui.adsabs.harvard.edu/js/wraps/paper_network.js?v=v1.5.7-hotfix4 12.5 KB 12.4 KB https://ui.adsabs.harvard.edu/js/widgets/sort/redux/modules/sort-app.js?v=v1.5.7-hotfix4 3.3 KB 3.3 KB https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/containers/App....ainers/App.jsx.js 7.5 KB 7.5 KB https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/actions/index.js?v=v1.5.7-hotfix4 7.2 KB 7.1 KB https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/reducers/index.js?v=v1.5.7-hotfix4 3.5 KB 3.5 KB https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/components/App.jsx.js?v=v1.5.7-hotfix4 5.4 KB 5.2 KB https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/actions.js?v=v1.5.7-hotfix4 2.3 KB 2.2 KB https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/middleware.js?v=v1.5.7-hotfix4 4.3 KB 4.2 KB https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/reducer.js?v=v1.5.7-hotfix4 4.0 KB 3.9 KB https://ui.adsabs.harvard.edu/js/react/shared/helpers.js?v=v1.5.7-hotfix4 3.7 KB 3.6 KB https://ui.adsabs.harvard.edu/js/react/shared/middleware/api.js?v=v1.5.7-hotfix4 2.3 KB 2.3 KB https://ui.adsabs.harvard.edu/js/widgets/export/reducers/index.js?v=v1.5.7-hotfix4 6.3 KB 6.3 KB https://ui.adsabs.harvard.edu/js/widgets/export/actions/index.js?v=v1.5.7-hotfix4 6.2 KB 6.1 KB https://ui.adsabs.harvard.edu/js/widgets/export/containers/App.jsx.js?v=v1.5.7-hotfix4 7.8 KB 7.7 KB https://ui.adsabs.harvard.edu/js/wraps/templates/paper-network-data.html?v=v1.5.7-hotfix4 2.5 KB 2.5 KB https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/models/authorAf...horAffiliation.js 3.0 KB 3.0 KB https://ui.adsabs.harvard.edu/js/widgets/orcid-selector/components/orcid-selecto...lector-app.jsx.js 5.0 KB 5.0 KB https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/components/CollapsePanel.js...lapsePanel.jsx.js 4.0 KB 4.0 KB https://ui.adsabs.harvard.edu/js/widgets/export/components/Setup.jsx.js?v=v1.5.7-hotfix4 4.1 KB 4.0 KB https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/components/SaveQueryForm.js...eQueryForm.jsx.js 5.3 KB 5.2 KB https://ui.adsabs.harvard.edu/js/widgets/export/components/ClipboardBtn.jsx.js?v=v1.5.7-hotfix4 3.4 KB 3.2 KB https://ui.adsabs.harvard.edu/v1/search/query...u/v1/search/query 95.1 KB 94.7 KB https://ui.adsabs.harvard.edu/v1/search/query...u/v1/search/query 44.8 KB 44.5 KB
Total CSS size shouldn't be too big (cssSize)	The total CSS transfer size is 391.6 kB and uncompressed size is 427.9 kB. That is big and the CSS could most probably be smaller.	0
Description: Delivering a massive amount of CSS to the browser is not the best thing you can do, because it means more work for the browser when parsing the CSS against the HTML and that makes the rendering slower. Try to send only the CSS that is used on that page. And make sure to remove CSS rules when they aren't used anymore.
Offenders: URL Transfer size Content size https://ui.adsabs.harvard.edu/styles/css/styles.css?v=v1.5.7-hotfix4 340.7 KB 340.5 KB https://www.gstatic.com/recaptcha/releases/lqsTZ5beIbCkK4uGEGv9JmUR/styles__ltr.css 41.7 KB 77.4 KB
Avoid too many fonts (fewFonts)	The page has 3 font requests. Do you really need them? What value does the fonts give the user?	70
Description: How many fonts do you need on a page for the user to get the message? Fonts can slow down the rendering of content, try to avoid loading too many of them because worst case it can make the text invisible until they are loaded (FOIT—flash of invisible text), best case they will flicker the text content when they arrive.
Offenders: https://fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu4mxK.woff2 https://fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc4.woff2 https://ui.adsabs.harvard.edu/libs/fontawesome/fonts/fontawesome-webfont.woff2?v=4.7.0
Total JavaScript size shouldn't be too big (javascriptSize)	The total JavaScript transfer size is 2.6 MB and the uncompressed size is 4.8 MB. This is totally crazy! There is really room for improvement here.	0
Description: A lot of JavaScript often means you are downloading more than you need. How complex is the page and what can the user do on the page? Do you use multiple JavaScript frameworks?
Offenders: URL Transfer size Content size https://ui.adsabs.harvard.edu/libs/require.js 69.6 KB 69.3 KB https://ui.adsabs.harvard.edu/config/shim.js?v=v1.5.7-hotfix4 2.7 KB 2.7 KB https://www.google.com/recaptcha/api.js?render=6LcpTuUnAAAAAD6YCBdr_2-0b1AH8N6nXkYEG5G5 1.4 KB 1.4 KB https://js.sentry-cdn.com/46062cbe0aeb7a3b2bb4c3a9b8cd1ac7.min.js 2.5 KB 2.8 KB https://www.gstatic.com/recaptcha/releases/lqsTZ5beIbCkK4uGEGv9JmUR/recaptcha__en.js 216.2 KB 544.2 KB https://www.googletagmanager.com/gtm.js?id=GTM-NT2453N 81.4 KB 244.1 KB https://browser.sentry-cdn.com/7.119.2/bundle.tracing.replay.min.js 71.4 KB 223.3 KB https://ui.adsabs.harvard.edu/config/main.config.js?v=v1.5.7-hotfix4 16.1 KB 15.9 KB https://ui.adsabs.harvard.edu/config/main.bundle.js?v=v1.5.7-hotfix4 445.5 KB 445.2 KB https://ui.adsabs.harvard.edu/config/search-page.config.js?v=v1.5.7-hotfix4 15.8 KB 15.7 KB https://ui.adsabs.harvard.edu/config/search-page.bundle.js?v=v1.5.7-hotfix4 641.9 KB 641.5 KB https://ui.adsabs.harvard.edu/config/discovery.vars.js?v=v1.5.7-hotfix4 1.9 KB 1.8 KB https://cdn.jsdelivr.net/npm/regenerator-runtime@0.13.9/runtime.js?v=v1.5.7-hotfix4 7.5 KB 24.3 KB https://ui.adsabs.harvard.edu/libs/polyfill.js?v=v1.5.7-hotfix4 25.0 KB 24.9 KB https://cdn.jsdelivr.net/npm/lodash@2.4.2/dist/lodash.compat.min.js?v=v1.5.7-hotfix4 12.7 KB 33.2 KB https://cdn.jsdelivr.net/npm/jquery@2.2.4/dist/jquery.min.js?v=v1.5.7-hotfix4 31.4 KB 83.6 KB https://cdn.jsdelivr.net/npm/d3@3.5.17/d3.min.js?v=v1.5.7-hotfix4 54.3 KB 148.2 KB https://www.googletagmanager.com/gtag/js?id=G-X07MS2584V&l=dataLayer&cx=c 99.8 KB 292.5 KB https://unpkg.com/web-vitals@4.2.4/dist/web-vitals.iife.js 3.5 KB 7.1 KB https://cdn.jsdelivr.net/npm/backbone@1.1.2/backbone-min.js?v=v1.5.7-hotfix4 7.1 KB 19.5 KB https://cdn.jsdelivr.net/npm/d3-cloud@1.2.5/build/d3.layout.cloud.js?v=v1.5.7-hotfix4 4.9 KB 14.3 KB https://cdn.jsdelivr.net/npm/backbone-validation@0.11.3/dist/backbone-validation...dation-amd-min.js 3.5 KB 9.4 KB https://www.gstatic.com/recaptcha/releases/lqsTZ5beIbCkK4uGEGv9JmUR/recaptcha__en.js 215.8 KB 544.2 KB https://cdn.jsdelivr.net/npm/react@16/umd/react.production.min.js?v=v1.5.7-hotfix4 5.2 KB 12.2 KB https://cdn.jsdelivr.net/npm/jsonpath@0.2.12/jsonpath.min.js?v=v1.5.7-hotfix4 27.5 KB 82.7 KB https://cdn.jsdelivr.net/npm/hotkeys-js@3.8.7/dist/hotkeys.min.js?v=v1.5.7-hotfix4 2.8 KB 5.6 KB https://cdn.jsdelivr.net/npm/react-dom@17.0.2/umd/react-dom.production.min.js?v=v1.5.7-hotfix4 40.7 KB 117.8 KB https://cdn.jsdelivr.net/npm/react-redux@7.2.4/dist/react-redux.min.js?v=v1.5.7-hotfix4 5.5 KB 14.4 KB https://cdn.jsdelivr.net/npm/prop-types@15.6/prop-types.min.js?v=v1.5.7-hotfix4 958 B 1.6 KB https://cdn.jsdelivr.net/npm/redux@4.0.5/dist/redux.min.js?v=v1.5.7-hotfix4 2.7 KB 6.5 KB https://cdn.jsdelivr.net/npm/redux-thunk@2.3.0/dist/redux-thunk.min.js?v=v1.5.7-hotfix4 509 B 692 B https://cdn.jsdelivr.net/npm/moment@2.22.2/min/moment.min.js?v=v1.5.7-hotfix4 17.7 KB 50.5 KB https://ui.adsabs.harvard.edu/libs/sprintf.js?v=v1.5.7-hotfix4 3.7 KB 3.6 KB https://cdn.jsdelivr.net/npm/backbone.marionette@2.4.5/lib/backbone.marionette.m...marionette.min.js 12.4 KB 44.0 KB https://cdn.jsdelivr.net/npm/persist-js@0.3.1/persist-min.js?v=v1.5.7-hotfix4 3.6 KB 9.3 KB https://code.jquery.com/ui/1.12.1/jquery-ui.min.js?v=v1.5.7-hotfix4 66.5 KB 247.7 KB https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/js/bootstrap.min.js?v=v1.5.7-hotfix4 10.5 KB 36.2 KB https://www.google.com/js/bg/9J_OlxnAizjMJN_fZ8JRYj0PV4Me2EAx1CVcnywh2Sk.js 7.9 KB 18.5 KB https://cdn.jsdelivr.net/npm/bowser@2.11.0/es5.js?v=v1.5.7-hotfix4 6.0 KB 25.4 KB https://cdn.jsdelivr.net/npm/select2@4.0.3/dist/js/select2.min.js?v=v1.5.7-hotfix4 19.8 KB 65.1 KB https://ui.adsabs.harvard.edu/js/widgets/sort/widget.jsx.js?v=v1.5.7-hotfix4 1.9 KB 1.8 KB https://cdn.jsdelivr.net/npm/clipboard@1.7.1/dist/clipboard.min.js?v=v1.5.7-hotfix4 3.9 KB 10.7 KB https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/widget.jsx.js?v=v1.5.7-hotfix4 3.2 KB 3.1 KB https://ui.adsabs.harvard.edu/js/widgets/export/widget.jsx.js?v=v1.5.7-hotfix4 4.6 KB 4.5 KB https://ui.adsabs.harvard.edu/js/wraps/author_network.js?v=v1.5.7-hotfix4 781 B 733 B https://ui.adsabs.harvard.edu/js/wraps/paper_network.js?v=v1.5.7-hotfix4 12.5 KB 12.4 KB https://ui.adsabs.harvard.edu/js/widgets/orcid-selector/widget.jsx.js?v=v1.5.7-hotfix4 1.2 KB 1.2 KB https://cdn.jsdelivr.net/npm/mathjax@2.7.4/MathJax.js...@2.7.4/MathJax.js 20.3 KB 61.9 KB https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/index.js?v=v1.5.7-hotfix4 617 B 547 B https://ui.adsabs.harvard.edu/js/widgets/sort/redux/configure-store.js?v=v1.5.7-hotfix4 298 B 252 B https://ui.adsabs.harvard.edu/js/widgets/sort/redux/modules/sort-app.js?v=v1.5.7-hotfix4 3.3 KB 3.3 KB https://ui.adsabs.harvard.edu/js/widgets/sort/containers/sort-container.js?v=v1.5.7-hotfix4 322 B 275 B https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/containers/App....ainers/App.jsx.js 7.5 KB 7.5 KB https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/constants/actio...ts/actionNames.js 364 B 317 B https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/actions/index.js?v=v1.5.7-hotfix4 7.2 KB 7.1 KB https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/reducers/index.js?v=v1.5.7-hotfix4 3.5 KB 3.5 KB https://ui.adsabs.harvard.edu/js/widgets/orcid-selector/redux/configure-store.js?v=v1.5.7-hotfix4 312 B 262 B https://ui.adsabs.harvard.edu/js/widgets/orcid-selector/redux/modules/orcid-sele...d-selector-app.js 2.0 KB 1.9 KB https://ui.adsabs.harvard.edu/js/widgets/orcid-selector/containers/orcid-selecto...ctor-container.js 419 B 365 B https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/components/App.jsx.js?v=v1.5.7-hotfix4 5.4 KB 5.2 KB https://ui.adsabs.harvard.edu/js/react/WithBackboneView.js?v=v1.5.7-hotfix4 735 B 688 B https://ui.adsabs.harvard.edu/js/react/configureStore.js?v=v1.5.7-hotfix4 251 B 205 B https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/actions.js?v=v1.5.7-hotfix4 2.3 KB 2.2 KB https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/middleware.js?v=v1.5.7-hotfix4 4.3 KB 4.2 KB https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/reducer.js?v=v1.5.7-hotfix4 4.0 KB 3.9 KB https://ui.adsabs.harvard.edu/js/react/shared/helpers.js?v=v1.5.7-hotfix4 3.7 KB 3.6 KB https://ui.adsabs.harvard.edu/js/react/shared/middleware/api.js?v=v1.5.7-hotfix4 2.3 KB 2.3 KB https://ui.adsabs.harvard.edu/js/widgets/export/reducers/index.js?v=v1.5.7-hotfix4 6.3 KB 6.3 KB https://ui.adsabs.harvard.edu/js/widgets/export/actions/index.js?v=v1.5.7-hotfix4 6.2 KB 6.1 KB https://ui.adsabs.harvard.edu/js/widgets/export/containers/App.jsx.js?v=v1.5.7-hotfix4 7.8 KB 7.7 KB https://cdn.jsdelivr.net/npm/mathjax@2.7.4/config/TeX-AMS_HTML.js?V=2.7.4 65.0 KB 216.4 KB https://ui.adsabs.harvard.edu/js/widgets/sort/components/sort-app.jsx.js?v=v1.5.7-hotfix4 1.3 KB 1.2 KB https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Expo...matControl.jsx.js 398 B 328 B https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Sele...ionButtons.jsx.js 394 B 347 B https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Row....onents/Row.jsx.js 1.0 KB 1004 B https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Mess...ts/Message.jsx.js 262 B 216 B https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Load...ts/Loading.jsx.js 566 B 520 B https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Clos...nts/Closer.jsx.js 477 B 430 B https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/models/authorAf...horAffiliation.js 3.0 KB 3.0 KB https://cdn.jsdelivr.net/npm/file-saver@1.3.8/FileSaver.min.js?v=v1.5.7-hotfix4 1.3 KB 2.4 KB https://ui.adsabs.harvard.edu/js/widgets/orcid-selector/components/orcid-selecto...lector-app.jsx.js 5.0 KB 5.0 KB https://cdn.jsdelivr.net/npm/react-bootstrap@0.33.0/dist/react-bootstrap.min.js?v=v1.5.7-hotfix4 42.8 KB 162.1 KB https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/components/CollapsePanel.js...lapsePanel.jsx.js 4.0 KB 4.0 KB https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/containers/SaveQueryForm.js?v=v1.5.7-hotfix4 368 B 319 B https://ui.adsabs.harvard.edu/js/widgets/export/components/Closer.jsx.js?v=v1.5.7-hotfix4 517 B 468 B https://ui.adsabs.harvard.edu/js/widgets/export/components/Setup.jsx.js?v=v1.5.7-hotfix4 4.1 KB 4.0 KB https://ui.adsabs.harvard.edu/js/widgets/export/components/Export.jsx.js?v=v1.5.7-hotfix4 1.3 KB 1.3 KB https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Last...iveDateRow.jsx.js 322 B 270 B https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Affi...liationRow.jsx.js 483 B 431 B https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/components/SaveQueryForm.js...eQueryForm.jsx.js 5.3 KB 5.2 KB https://ui.adsabs.harvard.edu/js/widgets/export/components/ClipboardBtn.jsx.js?v=v1.5.7-hotfix4 3.4 KB 3.2 KB https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/constants.js?v=v1.5.7-hotfix4 151 B 88 B
Make each CSS response small (optimalCssSize)	https://ui.adsabs.harvard.edu/styles/css/styles.css?v=v1.5.7-hotfix4 size is 348.9 kB (348902) and that is bigger than the limit of 14.5 kB. https://www.gstatic.com/recaptcha/releases/lqsTZ5beIbCkK4uGEGv9JmUR/styles__ltr.css size is 42.7 kB (42668) and that is bigger than the limit of 14.5 kB. Try to make the CSS files fit into 14.5 KB.	80
Description: Make CSS responses small to fit into the magic number TCP window size of 14.5 KB. The browser can then download the CSS faster and that will make the page start rendering earlier.
Offenders: URL Transfer size Content size https://ui.adsabs.harvard.edu/styles/css/styles.css?v=v1.5.7-hotfix4 340.7 KB 340.5 KB https://www.gstatic.com/recaptcha/releases/lqsTZ5beIbCkK4uGEGv9JmUR/styles__ltr.css 41.7 KB 77.4 KB
Total page size shouldn't be too big (pageSize)	The page total transfer size is 3.4 MB, which is more than the coach limit of 2 MB. That is really big and you need to make it smaller.	0
Description: Avoid having pages that have a transfer size over the wire of more than 2 MB (desktop) and 1 MB (mobile) because that is really big and will hurt performance and will make the page expensive for the user if she/he pays for the bandwidth.
Offenders: URL Transfer size Content size https://ui.adsabs.harvard.edu/search/q=abs%3A%22dark%20energy%22&sort=date%20des...bcode%20desc&p_=0 8.2 KB 8.0 KB https://ui.adsabs.harvard.edu/styles/css/styles.css?v=v1.5.7-hotfix4 340.7 KB 340.5 KB https://ui.adsabs.harvard.edu/libs/require.js 69.6 KB 69.3 KB https://ui.adsabs.harvard.edu/config/shim.js?v=v1.5.7-hotfix4 2.7 KB 2.7 KB https://www.google.com/recaptcha/api.js?render=6LcpTuUnAAAAAD6YCBdr_2-0b1AH8N6nXkYEG5G5 1.4 KB 1.4 KB https://js.sentry-cdn.com/46062cbe0aeb7a3b2bb4c3a9b8cd1ac7.min.js 2.5 KB 2.8 KB https://www.gstatic.com/recaptcha/releases/lqsTZ5beIbCkK4uGEGv9JmUR/recaptcha__en.js 216.2 KB 544.2 KB https://www.googletagmanager.com/gtm.js?id=GTM-NT2453N 81.4 KB 244.1 KB https://browser.sentry-cdn.com/7.119.2/bundle.tracing.replay.min.js 71.4 KB 223.3 KB https://ui.adsabs.harvard.edu/config/main.config.js?v=v1.5.7-hotfix4 16.1 KB 15.9 KB https://ui.adsabs.harvard.edu/config/main.bundle.js?v=v1.5.7-hotfix4 445.5 KB 445.2 KB https://ui.adsabs.harvard.edu/config/search-page.config.js?v=v1.5.7-hotfix4 15.8 KB 15.7 KB https://ui.adsabs.harvard.edu/config/search-page.bundle.js?v=v1.5.7-hotfix4 641.9 KB 641.5 KB https://ui.adsabs.harvard.edu/config/discovery.vars.js?v=v1.5.7-hotfix4 1.9 KB 1.8 KB https://cdn.jsdelivr.net/npm/regenerator-runtime@0.13.9/runtime.js?v=v1.5.7-hotfix4 7.5 KB 24.3 KB https://ui.adsabs.harvard.edu/libs/polyfill.js?v=v1.5.7-hotfix4 25.0 KB 24.9 KB https://cdn.jsdelivr.net/npm/lodash@2.4.2/dist/lodash.compat.min.js?v=v1.5.7-hotfix4 12.7 KB 33.2 KB https://cdn.jsdelivr.net/npm/jquery@2.2.4/dist/jquery.min.js?v=v1.5.7-hotfix4 31.4 KB 83.6 KB https://cdn.jsdelivr.net/npm/d3@3.5.17/d3.min.js?v=v1.5.7-hotfix4 54.3 KB 148.2 KB https://www.googletagmanager.com/gtag/js?id=G-X07MS2584V&l=dataLayer&cx=c 99.8 KB 292.5 KB https://unpkg.com/web-vitals/dist/web-vitals.iife.js N/A 0 b https://www.google-analytics.com/g/collect...ics.com/g/collect 24 B 0 b https://www.google-analytics.com/g/collect...ics.com/g/collect 546 B 0 b https://www.google.com/recaptcha/api2/anchor...ptcha/api2/anchor 31.4 KB 49.8 KB https://unpkg.com/web-vitals@4.2.4/dist/web-vitals.iife.js 3.5 KB 7.1 KB https://cdn.jsdelivr.net/npm/backbone@1.1.2/backbone-min.js?v=v1.5.7-hotfix4 7.1 KB 19.5 KB https://cdn.jsdelivr.net/npm/d3-cloud@1.2.5/build/d3.layout.cloud.js?v=v1.5.7-hotfix4 4.9 KB 14.3 KB https://www.google-analytics.com/g/collect...ics.com/g/collect 24 B 0 b https://cdn.jsdelivr.net/npm/backbone-validation@0.11.3/dist/backbone-validation...dation-amd-min.js 3.5 KB 9.4 KB https://www.gstatic.com/recaptcha/releases/lqsTZ5beIbCkK4uGEGv9JmUR/styles__ltr.css 41.7 KB 77.4 KB https://www.gstatic.com/recaptcha/releases/lqsTZ5beIbCkK4uGEGv9JmUR/recaptcha__en.js 215.8 KB 544.2 KB https://cdn.jsdelivr.net/npm/react@16/umd/react.production.min.js?v=v1.5.7-hotfix4 5.2 KB 12.2 KB https://cdn.jsdelivr.net/npm/jsonpath@0.2.12/jsonpath.min.js?v=v1.5.7-hotfix4 27.5 KB 82.7 KB https://cdn.jsdelivr.net/npm/hotkeys-js@3.8.7/dist/hotkeys.min.js?v=v1.5.7-hotfix4 2.8 KB 5.6 KB https://cdn.jsdelivr.net/npm/react-dom@17.0.2/umd/react-dom.production.min.js?v=v1.5.7-hotfix4 40.7 KB 117.8 KB https://cdn.jsdelivr.net/npm/react-redux@7.2.4/dist/react-redux.min.js?v=v1.5.7-hotfix4 5.5 KB 14.4 KB https://cdn.jsdelivr.net/npm/prop-types@15.6/prop-types.min.js?v=v1.5.7-hotfix4 958 B 1.6 KB https://cdn.jsdelivr.net/npm/redux@4.0.5/dist/redux.min.js?v=v1.5.7-hotfix4 2.7 KB 6.5 KB https://cdn.jsdelivr.net/npm/redux-thunk@2.3.0/dist/redux-thunk.min.js?v=v1.5.7-hotfix4 509 B 692 B https://cdn.jsdelivr.net/npm/moment@2.22.2/min/moment.min.js?v=v1.5.7-hotfix4 17.7 KB 50.5 KB https://ui.adsabs.harvard.edu/libs/sprintf.js?v=v1.5.7-hotfix4 3.7 KB 3.6 KB https://cdn.jsdelivr.net/npm/backbone.marionette@2.4.5/lib/backbone.marionette.m...marionette.min.js 12.4 KB 44.0 KB https://cdn.jsdelivr.net/npm/persist-js@0.3.1/persist-min.js?v=v1.5.7-hotfix4 3.6 KB 9.3 KB https://code.jquery.com/ui/1.12.1/jquery-ui.min.js?v=v1.5.7-hotfix4 66.5 KB 247.7 KB https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/js/bootstrap.min.js?v=v1.5.7-hotfix4 10.5 KB 36.2 KB https://ui.adsabs.harvard.edu/v1/accounts/bootstrap 1.6 KB 472 B https://www.google.com/js/bg/9J_OlxnAizjMJN_fZ8JRYj0PV4Me2EAx1CVcnywh2Sk.js 7.9 KB 18.5 KB https://www.gstatic.com/recaptcha/api2/logo_48.png 2.3 KB 2.2 KB https://fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu4mxK.woff2 15.5 KB 15.0 KB https://fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc4.woff2 15.3 KB 15.2 KB https://ui.adsabs.harvard.edu/v1/accounts/bootstrap 815 B 472 B https://ui.adsabs.harvard.edu/styles/img/transparent_logo.svg 3.4 KB 3.2 KB https://ui.adsabs.harvard.edu/styles/img/orcid-inactive.svg 523 B 475 B https://ui.adsabs.harvard.edu/styles/img/smithsonian-logo.svg 10.6 KB 10.6 KB https://ui.adsabs.harvard.edu/styles/img/cfa.png 55.9 KB 55.8 KB https://ui.adsabs.harvard.edu/styles/img/nasa-partner.svg 10.1 KB 10.0 KB https://ui.adsabs.harvard.edu/libs/fontawesome/fonts/fontawesome-webfont.woff2?v=4.7.0 75.5 KB 75.4 KB https://cdn.jsdelivr.net/npm/bowser@2.11.0/es5.js?v=v1.5.7-hotfix4 6.0 KB 25.4 KB https://cdn.jsdelivr.net/npm/select2@4.0.3/dist/js/select2.min.js?v=v1.5.7-hotfix4 19.8 KB 65.1 KB https://ui.adsabs.harvard.edu/js/widgets/sort/widget.jsx.js?v=v1.5.7-hotfix4 1.9 KB 1.8 KB https://cdn.jsdelivr.net/npm/clipboard@1.7.1/dist/clipboard.min.js?v=v1.5.7-hotfix4 3.9 KB 10.7 KB https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/widget.jsx.js?v=v1.5.7-hotfix4 3.2 KB 3.1 KB https://ui.adsabs.harvard.edu/js/widgets/export/widget.jsx.js?v=v1.5.7-hotfix4 4.6 KB 4.5 KB https://ui.adsabs.harvard.edu/js/wraps/author_network.js?v=v1.5.7-hotfix4 781 B 733 B https://ui.adsabs.harvard.edu/js/wraps/paper_network.js?v=v1.5.7-hotfix4 12.5 KB 12.4 KB https://ui.adsabs.harvard.edu/styles/img/reads_vs_time.png 6.6 KB 6.5 KB https://ui.adsabs.harvard.edu/styles/img/citations_vs_time.png 6.7 KB 6.7 KB https://ui.adsabs.harvard.edu/styles/img/reads_vs_citations.png 8.3 KB 8.2 KB https://ui.adsabs.harvard.edu/js/widgets/orcid-selector/widget.jsx.js?v=v1.5.7-hotfix4 1.2 KB 1.2 KB https://cdn.jsdelivr.net/npm/mathjax@2.7.4/MathJax.js...@2.7.4/MathJax.js 20.3 KB 61.9 KB https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/index.js?v=v1.5.7-hotfix4 617 B 547 B https://ui.adsabs.harvard.edu/styles/css/images/ui-bg_flat_75_ffffff_40x100.png 155 B 86 B https://ui.adsabs.harvard.edu/js/widgets/sort/redux/configure-store.js?v=v1.5.7-hotfix4 298 B 252 B https://ui.adsabs.harvard.edu/js/widgets/sort/redux/modules/sort-app.js?v=v1.5.7-hotfix4 3.3 KB 3.3 KB https://ui.adsabs.harvard.edu/js/widgets/sort/containers/sort-container.js?v=v1.5.7-hotfix4 322 B 275 B https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/containers/App....ainers/App.jsx.js 7.5 KB 7.5 KB https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/constants/actio...ts/actionNames.js 364 B 317 B https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/actions/index.js?v=v1.5.7-hotfix4 7.2 KB 7.1 KB https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/reducers/index.js?v=v1.5.7-hotfix4 3.5 KB 3.5 KB https://ui.adsabs.harvard.edu/js/widgets/orcid-selector/redux/configure-store.js?v=v1.5.7-hotfix4 312 B 262 B https://ui.adsabs.harvard.edu/js/widgets/orcid-selector/redux/modules/orcid-sele...d-selector-app.js 2.0 KB 1.9 KB https://ui.adsabs.harvard.edu/js/widgets/orcid-selector/containers/orcid-selecto...ctor-container.js 419 B 365 B https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/components/App.jsx.js?v=v1.5.7-hotfix4 5.4 KB 5.2 KB https://ui.adsabs.harvard.edu/js/react/WithBackboneView.js?v=v1.5.7-hotfix4 735 B 688 B https://ui.adsabs.harvard.edu/js/react/configureStore.js?v=v1.5.7-hotfix4 251 B 205 B https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/actions.js?v=v1.5.7-hotfix4 2.3 KB 2.2 KB https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/middleware.js?v=v1.5.7-hotfix4 4.3 KB 4.2 KB https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/reducer.js?v=v1.5.7-hotfix4 4.0 KB 3.9 KB https://ui.adsabs.harvard.edu/js/react/shared/helpers.js?v=v1.5.7-hotfix4 3.7 KB 3.6 KB https://ui.adsabs.harvard.edu/js/react/shared/middleware/api.js?v=v1.5.7-hotfix4 2.3 KB 2.3 KB https://ui.adsabs.harvard.edu/js/widgets/export/reducers/index.js?v=v1.5.7-hotfix4 6.3 KB 6.3 KB https://ui.adsabs.harvard.edu/js/widgets/export/actions/index.js?v=v1.5.7-hotfix4 6.2 KB 6.1 KB https://ui.adsabs.harvard.edu/js/widgets/export/containers/App.jsx.js?v=v1.5.7-hotfix4 7.8 KB 7.7 KB https://ui.adsabs.harvard.edu/js/wraps/templates/paper-network-data.html?v=v1.5.7-hotfix4 2.5 KB 2.5 KB https://ui.adsabs.harvard.edu/js/wraps/templates/paper-network-container.html?v=v1.5.7-hotfix4 1.1 KB 1.1 KB https://ui.adsabs.harvard.edu/js/wraps/templates/paper-network-link-data.html?v=v1.5.7-hotfix4 1.2 KB 1.1 KB https://cdn.jsdelivr.net/npm/mathjax@2.7.4/config/TeX-AMS_HTML.js?V=2.7.4 65.0 KB 216.4 KB https://ui.adsabs.harvard.edu/js/widgets/sort/components/sort-app.jsx.js?v=v1.5.7-hotfix4 1.3 KB 1.2 KB https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Expo...matControl.jsx.js 398 B 328 B https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Sele...ionButtons.jsx.js 394 B 347 B https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Row....onents/Row.jsx.js 1.0 KB 1004 B https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Mess...ts/Message.jsx.js 262 B 216 B https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Load...ts/Loading.jsx.js 566 B 520 B https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Clos...nts/Closer.jsx.js 477 B 430 B https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/models/authorAf...horAffiliation.js 3.0 KB 3.0 KB https://cdn.jsdelivr.net/npm/file-saver@1.3.8/FileSaver.min.js?v=v1.5.7-hotfix4 1.3 KB 2.4 KB https://ui.adsabs.harvard.edu/js/widgets/orcid-selector/components/orcid-selecto...lector-app.jsx.js 5.0 KB 5.0 KB https://cdn.jsdelivr.net/npm/react-bootstrap@0.33.0/dist/react-bootstrap.min.js?v=v1.5.7-hotfix4 42.8 KB 162.1 KB https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/components/CollapsePanel.js...lapsePanel.jsx.js 4.0 KB 4.0 KB https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/containers/SaveQueryForm.js?v=v1.5.7-hotfix4 368 B 319 B https://ui.adsabs.harvard.edu/js/widgets/export/components/Closer.jsx.js?v=v1.5.7-hotfix4 517 B 468 B https://ui.adsabs.harvard.edu/js/widgets/export/components/Setup.jsx.js?v=v1.5.7-hotfix4 4.1 KB 4.0 KB https://ui.adsabs.harvard.edu/js/widgets/export/components/Export.jsx.js?v=v1.5.7-hotfix4 1.3 KB 1.3 KB https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Last...iveDateRow.jsx.js 322 B 270 B https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Affi...liationRow.jsx.js 483 B 431 B https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/components/SaveQueryForm.js...eQueryForm.jsx.js 5.3 KB 5.2 KB https://ui.adsabs.harvard.edu/js/widgets/export/components/ClipboardBtn.jsx.js?v=v1.5.7-hotfix4 3.4 KB 3.2 KB https://ui.adsabs.harvard.edu/v1/vault/configuration/site_wide_message 1.4 KB 195 B https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/constants.js?v=v1.5.7-hotfix4 151 B 88 B https://ui.adsabs.harvard.edu/favicon-32x32.png 1.6 KB 1.5 KB https://ui.adsabs.harvard.edu/v1/search/query...u/v1/search/query 95.1 KB 94.7 KB https://ui.adsabs.harvard.edu/v1/search/query...u/v1/search/query 1.6 KB 1.3 KB https://ui.adsabs.harvard.edu/v1/search/query...u/v1/search/query 1.1 KB 812 B https://ui.adsabs.harvard.edu/v1/search/query...u/v1/search/query 2.4 KB 1.2 KB https://ui.adsabs.harvard.edu/v1/search/query...u/v1/search/query 44.8 KB 44.5 KB https://o1060269.ingest.us.sentry.io/api/4507341192036352/envelope/...2036352/envelope/ 339 B 41 B https://o1060269.ingest.us.sentry.io/api/4507341192036352/envelope/...2036352/envelope/ 94 B 41 B https://www.google-analytics.com/g/collect...ics.com/g/collect 70 B 0 b https://www.google-analytics.com/g/collect...ics.com/g/collect 47 B 0 b https://www.google-analytics.com/g/collect...ics.com/g/collect 70 B 0 b
Don't use private headers on static content (privateAssets)	The page has 3 requests with private headers. Make sure that the assets really should be private and only used by one user. Otherwise, make it cacheable for everyone.	70
Description: If you set private headers on content, that means that the content are specific for that user. Static content should be able to be cached and used by everyone. Avoid setting the cache header to private.
Offenders: https://www.google.com/recaptcha/api.js?render=6LcpTuUnAAAAAD6YCBdr_2-0b1AH8N6nXkYEG5G5 https://www.googletagmanager.com/gtm.js?id=GTM-NT2453N https://www.googletagmanager.com/gtag/js?id=G-X07MS2584V&l=dataLayer&cx=c

Best practice advice (72)

Show/hide details

Title	Advice	Score
Cumulative Layout Shift (cumulativeLayoutShift)	You have a poor cumulative layout shift score (0.6482). It is in the Google Web Vitals poor range, with a shift higher than 0.25. You should manually check the filmstrip or video and check if it will affect the user.	0
Description: Cumulative Layout Shift measures the sum total of all individual layout shift scores for unexpected layout shift that occur. The metric is measuring visual stability by quantify how often users experience unexpected layout shifts. It is one of Google Web Vitals.
Have a good URL format (url)	The page is using more than two request parameters. You should really rethink and try to minimize the number of parameters. The URL is 106 characters long. Try to make it less than 100 characters. Could the developer or the CMS be on Windows? Avoid using spaces in the URLs, use hyphens or underscores.	30
Description: A clean URL is good for the user and for SEO. Make them human readable, avoid too long URLs, spaces in the URL, too many request parameters, and never ever have the session id in your URL.
Do not send too long headers (longHeaders)	https://js.sentry-cd...a9b8cd1ac7.min.js has a header content-security-policy that is 1060 characters long. https://ui.adsabs.ha...ccounts/bootstrap has a header access-control-allow-origin that is 1057 characters long. https://ui.adsabs.ha...ccounts/bootstrap has a header access-control-allow-origin that is 1057 characters long. https://ui.adsabs.ha...site_wide_message has a header access-control-allow-origin that is 1057 characters long. https://ui.adsabs.ha...u/v1/search/query has a header access-control-allow-origin that is 1057 characters long. https://ui.adsabs.ha...u/v1/search/query has a header access-control-allow-origin that is 1057 characters long. https://ui.adsabs.ha...u/v1/search/query has a header access-control-allow-origin that is 1057 characters long. https://ui.adsabs.ha...u/v1/search/query has a header access-control-allow-origin that is 1057 characters long. https://ui.adsabs.ha...u/v1/search/query has a header access-control-allow-origin that is 1057 characters long.	91
Description: Do not send response headers that are too long.
Offenders: https://js.sentry-cdn.com/46062cbe0aeb7a3b2bb4c3a9b8cd1ac7.min.js https://ui.adsabs.harvard.edu/v1/accounts/bootstrap https://ui.adsabs.harvard.edu/v1/accounts/bootstrap https://ui.adsabs.harvard.edu/v1/vault/configuration/site_wide_message https://ui.adsabs.harvard.edu/v1/search/query...u/v1/search/query https://ui.adsabs.harvard.edu/v1/search/query...u/v1/search/query https://ui.adsabs.harvard.edu/v1/search/query...u/v1/search/query https://ui.adsabs.harvard.edu/v1/search/query...u/v1/search/query https://ui.adsabs.harvard.edu/v1/search/query...u/v1/search/query
Avoid too many third party requests (thirdParty)	The page do 38% requests to third party domains (50 requests and 1.3 MB). First party is 80 requests and 2.1 MB. The regex .*harvard.* was used to calculate first/third party requests.	50
Description: Do not load most of your content from third party URLs.
Avoid unnecessary headers (unnecessaryHeaders)	There are 89 responses that sets both a max-age and expires header. There are 8 responses that sets a pragma no-cache header (that is a request header). There are 23 responses that sets a server header.	0
Description: Do not send headers that you don't need. We look for p3p, cache-control and max-age, pragma, server and x-frame-options headers. Have a look at Andrew Betts - Headers for Hackers talk as a guide https://www.youtube.com/watch?v=k92ZbrY815c or read https://www.fastly.com/blog/headers-we-dont-want.
Offenders: https://ui.adsabs.harvard.edu/search/q=abs%3A%22dark%20energy%22&sort=date%20des...bcode%20desc&p_=0 https://ui.adsabs.harvard.edu/styles/css/styles.css?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/libs/require.js https://ui.adsabs.harvard.edu/config/shim.js?v=v1.5.7-hotfix4 https://www.google.com/recaptcha/api.js?render=6LcpTuUnAAAAAD6YCBdr_2-0b1AH8N6nXkYEG5G5 https://www.google.com/recaptcha/api.js?render=6LcpTuUnAAAAAD6YCBdr_2-0b1AH8N6nXkYEG5G5 https://www.gstatic.com/recaptcha/releases/lqsTZ5beIbCkK4uGEGv9JmUR/recaptcha__en.js https://www.gstatic.com/recaptcha/releases/lqsTZ5beIbCkK4uGEGv9JmUR/recaptcha__en.js https://www.googletagmanager.com/gtm.js?id=GTM-NT2453N https://www.googletagmanager.com/gtm.js?id=GTM-NT2453N https://browser.sentry-cdn.com/7.119.2/bundle.tracing.replay.min.js https://browser.sentry-cdn.com/7.119.2/bundle.tracing.replay.min.js https://ui.adsabs.harvard.edu/config/main.config.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/config/main.bundle.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/config/search-page.config.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/config/search-page.bundle.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/config/discovery.vars.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/libs/polyfill.js?v=v1.5.7-hotfix4 https://www.googletagmanager.com/gtag/js?id=G-X07MS2584V&l=dataLayer&cx=c https://www.googletagmanager.com/gtag/js?id=G-X07MS2584V&l=dataLayer&cx=c https://unpkg.com/web-vitals/dist/web-vitals.iife.js https://www.google-analytics.com/g/collect...ics.com/g/collect https://www.google-analytics.com/g/collect...ics.com/g/collect https://www.google-analytics.com/g/collect...ics.com/g/collect https://www.google-analytics.com/g/collect...ics.com/g/collect https://www.google-analytics.com/g/collect...ics.com/g/collect https://www.google-analytics.com/g/collect...ics.com/g/collect https://www.google.com/recaptcha/api2/anchor...ptcha/api2/anchor https://www.google.com/recaptcha/api2/anchor...ptcha/api2/anchor https://www.google.com/recaptcha/api2/anchor...ptcha/api2/anchor https://unpkg.com/web-vitals@4.2.4/dist/web-vitals.iife.js https://www.google-analytics.com/g/collect...ics.com/g/collect https://www.google-analytics.com/g/collect...ics.com/g/collect https://www.google-analytics.com/g/collect...ics.com/g/collect https://www.gstatic.com/recaptcha/releases/lqsTZ5beIbCkK4uGEGv9JmUR/styles__ltr.css https://www.gstatic.com/recaptcha/releases/lqsTZ5beIbCkK4uGEGv9JmUR/styles__ltr.css https://www.gstatic.com/recaptcha/releases/lqsTZ5beIbCkK4uGEGv9JmUR/recaptcha__en.js https://www.gstatic.com/recaptcha/releases/lqsTZ5beIbCkK4uGEGv9JmUR/recaptcha__en.js https://ui.adsabs.harvard.edu/libs/sprintf.js?v=v1.5.7-hotfix4 https://code.jquery.com/ui/1.12.1/jquery-ui.min.js?v=v1.5.7-hotfix4 https://www.google.com/js/bg/9J_OlxnAizjMJN_fZ8JRYj0PV4Me2EAx1CVcnywh2Sk.js https://www.google.com/js/bg/9J_OlxnAizjMJN_fZ8JRYj0PV4Me2EAx1CVcnywh2Sk.js https://www.gstatic.com/recaptcha/api2/logo_48.png https://www.gstatic.com/recaptcha/api2/logo_48.png https://fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu4mxK.woff2 https://fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu4mxK.woff2 https://fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc4.woff2 https://fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc4.woff2 https://ui.adsabs.harvard.edu/styles/img/transparent_logo.svg https://ui.adsabs.harvard.edu/styles/img/orcid-inactive.svg https://ui.adsabs.harvard.edu/styles/img/smithsonian-logo.svg https://ui.adsabs.harvard.edu/styles/img/cfa.png https://ui.adsabs.harvard.edu/styles/img/nasa-partner.svg https://ui.adsabs.harvard.edu/libs/fontawesome/fonts/fontawesome-webfont.woff2?v=4.7.0 https://ui.adsabs.harvard.edu/js/widgets/sort/widget.jsx.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/widget.jsx.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/export/widget.jsx.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/wraps/author_network.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/wraps/paper_network.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/styles/img/reads_vs_time.png https://ui.adsabs.harvard.edu/styles/img/citations_vs_time.png https://ui.adsabs.harvard.edu/styles/img/reads_vs_citations.png https://ui.adsabs.harvard.edu/js/widgets/orcid-selector/widget.jsx.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/index.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/styles/css/images/ui-bg_flat_75_ffffff_40x100.png https://ui.adsabs.harvard.edu/js/widgets/sort/redux/configure-store.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/sort/redux/modules/sort-app.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/sort/containers/sort-container.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/containers/App....ainers/App.jsx.js https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/constants/actio...ts/actionNames.js https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/actions/index.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/reducers/index.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/orcid-selector/redux/configure-store.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/orcid-selector/redux/modules/orcid-sele...d-selector-app.js https://ui.adsabs.harvard.edu/js/widgets/orcid-selector/containers/orcid-selecto...ctor-container.js https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/components/App.jsx.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/react/WithBackboneView.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/react/configureStore.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/actions.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/middleware.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/reducer.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/react/shared/helpers.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/react/shared/middleware/api.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/export/reducers/index.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/export/actions/index.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/export/containers/App.jsx.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/wraps/templates/paper-network-data.html?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/wraps/templates/paper-network-container.html?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/wraps/templates/paper-network-link-data.html?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/sort/components/sort-app.jsx.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Expo...matControl.jsx.js https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Sele...ionButtons.jsx.js https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Row....onents/Row.jsx.js https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Mess...ts/Message.jsx.js https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Load...ts/Loading.jsx.js https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Clos...nts/Closer.jsx.js https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/models/authorAf...horAffiliation.js https://ui.adsabs.harvard.edu/js/widgets/orcid-selector/components/orcid-selecto...lector-app.jsx.js https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/components/CollapsePanel.js...lapsePanel.jsx.js https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/containers/SaveQueryForm.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/export/components/Closer.jsx.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/export/components/Setup.jsx.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/export/components/Export.jsx.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Last...iveDateRow.jsx.js https://ui.adsabs.harvard.edu/js/widgets/author_affiliation_tool/components/Affi...liationRow.jsx.js https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/components/SaveQueryForm.js...eQueryForm.jsx.js https://ui.adsabs.harvard.edu/js/widgets/export/components/ClipboardBtn.jsx.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/js/react/MyAdsFreeform/constants.js?v=v1.5.7-hotfix4 https://ui.adsabs.harvard.edu/favicon-32x32.png https://o1060269.ingest.us.sentry.io/api/4507341192036352/envelope/...2036352/envelope/ https://o1060269.ingest.us.sentry.io/api/4507341192036352/envelope/...2036352/envelope/ https://www.google-analytics.com/g/collect...ics.com/g/collect https://www.google-analytics.com/g/collect...ics.com/g/collect https://www.google-analytics.com/g/collect...ics.com/g/collect https://www.google-analytics.com/g/collect...ics.com/g/collect https://www.google-analytics.com/g/collect...ics.com/g/collect https://www.google-analytics.com/g/collect...ics.com/g/collect https://www.google-analytics.com/g/collect...ics.com/g/collect https://www.google-analytics.com/g/collect...ics.com/g/collect https://www.google-analytics.com/g/collect...ics.com/g/collect

Privacy advice (73)

Show/hide details

Title	Advice	Score
Use a good Content-Security-Policy header to make sure you you avoid Cross Site Scripting (XSS) attacks. (contentSecurityPolicyHeader)	Set a Content-Security-Policy header to make sure you are not open for Cross Site Scripting (XSS) attacks. You can start with setting a Content-Security-Policy-Report-Only header, that will only report the violation, not stop the download.	0
Description: Content Security Policy is delivered via a HTTP response header, and defines approved sources of content that the browser may load. It can be an effective countermeasure to Cross Site Scripting (XSS) attacks and is also widely supported and usually easily deployed. https://scotthelme.co.uk/content-security-policy-an-introduction/.
Offenders: https://ui.adsabs.harvard.edu/search/q=abs%3A%22dark%20energy%22&sort=date%20des...bcode%20desc&p_=0
Avoid using Google reCAPTCHA (googleReCaptcha)	You share your user data with Google since you use Google reCAPTCHA.	0
Description: You should avoid using Google reCAPTCHA since it will share your users information with Google.
Offenders: https://www.google.com/recaptcha/api.js?render=6LcpTuUnAAAAAD6YCBdr_2-0b1AH8N6nXkYEG5G5
Set a referrer-policy header to make sure you do not leak user information. (referrerPolicyHeader)	Set a referrer-policy header to make sure you do not leak user information.	0
Description: Referrer Policy is a new header that allows a site to control how much information the browser includes with navigations away from a document and should be set by all sites. https://scotthelme.co.uk/a-new-security-header-referrer-policy/.
Offenders: https://ui.adsabs.harvard.edu/search/q=abs%3A%22dark%20energy%22&sort=date%20des...bcode%20desc&p_=0
Do not share user data with third parties. (thirdPartyPrivacy)	The page has 38% requests that are 3rd party (50 requests with a size of 1.3 MB). The page also have request to companies that harvest data from users and do not respect users privacy (see https://en.wikipedia.org/wiki/Surveillance_capitalism). The page do 7 utility requests and uses 2 utility tools. The page do 17 survelliance requests and uses 5 survelliance tools. The page do 2 tag-manager requests and uses 1 tag-manager tool. The page do 6 analytics requests and uses 1 analytics tool.	0
Description: Using third party requests shares user information with that third party. Please avoid that! The project https://github.com/patrickhulce/third-party-web is used to categorize first/third party requests.
Offenders: https://www.google.com/recaptcha/api.js?render=6LcpTuUnAAAAAD6YCBdr_2-0b1AH8N6nXkYEG5G5 https://js.sentry-cdn.com/46062cbe0aeb7a3b2bb4c3a9b8cd1ac7.min.js https://www.gstatic.com/recaptcha/releases/lqsTZ5beIbCkK4uGEGv9JmUR/recaptcha__en.js https://www.googletagmanager.com/gtm.js?id=GTM-NT2453N https://browser.sentry-cdn.com/7.119.2/bundle.tracing.replay.min.js https://cdn.jsdelivr.net/npm/regenerator-runtime@0.13.9/runtime.js?v=v1.5.7-hotfix4 https://cdn.jsdelivr.net/npm/lodash@2.4.2/dist/lodash.compat.min.js?v=v1.5.7-hotfix4 https://cdn.jsdelivr.net/npm/jquery@2.2.4/dist/jquery.min.js?v=v1.5.7-hotfix4 https://cdn.jsdelivr.net/npm/d3@3.5.17/d3.min.js?v=v1.5.7-hotfix4 https://www.googletagmanager.com/gtag/js?id=G-X07MS2584V&l=dataLayer&cx=c https://unpkg.com/web-vitals/dist/web-vitals.iife.js https://www.google-analytics.com/g/collect...ics.com/g/collect https://www.google-analytics.com/g/collect...ics.com/g/collect https://www.google.com/recaptcha/api2/anchor...ptcha/api2/anchor https://unpkg.com/web-vitals@4.2.4/dist/web-vitals.iife.js https://cdn.jsdelivr.net/npm/backbone@1.1.2/backbone-min.js?v=v1.5.7-hotfix4 https://cdn.jsdelivr.net/npm/d3-cloud@1.2.5/build/d3.layout.cloud.js?v=v1.5.7-hotfix4 https://www.google-analytics.com/g/collect...ics.com/g/collect https://cdn.jsdelivr.net/npm/backbone-validation@0.11.3/dist/backbone-validation...dation-amd-min.js https://www.gstatic.com/recaptcha/releases/lqsTZ5beIbCkK4uGEGv9JmUR/styles__ltr.css https://www.gstatic.com/recaptcha/releases/lqsTZ5beIbCkK4uGEGv9JmUR/recaptcha__en.js https://cdn.jsdelivr.net/npm/react@16/umd/react.production.min.js?v=v1.5.7-hotfix4 https://cdn.jsdelivr.net/npm/jsonpath@0.2.12/jsonpath.min.js?v=v1.5.7-hotfix4 https://cdn.jsdelivr.net/npm/hotkeys-js@3.8.7/dist/hotkeys.min.js?v=v1.5.7-hotfix4 https://cdn.jsdelivr.net/npm/react-dom@17.0.2/umd/react-dom.production.min.js?v=v1.5.7-hotfix4 https://cdn.jsdelivr.net/npm/react-redux@7.2.4/dist/react-redux.min.js?v=v1.5.7-hotfix4 https://cdn.jsdelivr.net/npm/prop-types@15.6/prop-types.min.js?v=v1.5.7-hotfix4 https://cdn.jsdelivr.net/npm/redux@4.0.5/dist/redux.min.js?v=v1.5.7-hotfix4 https://cdn.jsdelivr.net/npm/redux-thunk@2.3.0/dist/redux-thunk.min.js?v=v1.5.7-hotfix4 https://cdn.jsdelivr.net/npm/moment@2.22.2/min/moment.min.js?v=v1.5.7-hotfix4 https://cdn.jsdelivr.net/npm/backbone.marionette@2.4.5/lib/backbone.marionette.m...marionette.min.js https://cdn.jsdelivr.net/npm/persist-js@0.3.1/persist-min.js?v=v1.5.7-hotfix4 https://code.jquery.com/ui/1.12.1/jquery-ui.min.js?v=v1.5.7-hotfix4 https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/js/bootstrap.min.js?v=v1.5.7-hotfix4 https://www.google.com/js/bg/9J_OlxnAizjMJN_fZ8JRYj0PV4Me2EAx1CVcnywh2Sk.js https://www.gstatic.com/recaptcha/api2/logo_48.png https://fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu4mxK.woff2 https://fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc4.woff2 https://cdn.jsdelivr.net/npm/bowser@2.11.0/es5.js?v=v1.5.7-hotfix4 https://cdn.jsdelivr.net/npm/select2@4.0.3/dist/js/select2.min.js?v=v1.5.7-hotfix4 https://cdn.jsdelivr.net/npm/clipboard@1.7.1/dist/clipboard.min.js?v=v1.5.7-hotfix4 https://cdn.jsdelivr.net/npm/mathjax@2.7.4/MathJax.js...@2.7.4/MathJax.js https://cdn.jsdelivr.net/npm/mathjax@2.7.4/config/TeX-AMS_HTML.js?V=2.7.4 https://cdn.jsdelivr.net/npm/file-saver@1.3.8/FileSaver.min.js?v=v1.5.7-hotfix4 https://cdn.jsdelivr.net/npm/react-bootstrap@0.33.0/dist/react-bootstrap.min.js?v=v1.5.7-hotfix4 https://o1060269.ingest.us.sentry.io/api/4507341192036352/envelope/...2036352/envelope/ https://o1060269.ingest.us.sentry.io/api/4507341192036352/envelope/...2036352/envelope/ https://www.google-analytics.com/g/collect...ics.com/g/collect https://www.google-analytics.com/g/collect...ics.com/g/collect https://www.google-analytics.com/g/collect...ics.com/g/collect

Page info

Page info
Title	abs:"dark energy" - Astrophysics Data System
Width	1350
Height	3109
DOM elements	2509
Avg DOM depth	22
Max DOM depth	32
Iframes	2
Script tags	94
Local storage	662 B
Session storage	146 B
Network Information API	4g

Technologies used to build the page.

Data collected using Wappalyzerversion 6.10.66.  Use --browsertime.firefox.includeResponseBodies htmlor --browsertime.chrome.includeResponseBodies htmlto help Wappalyser find more information about technologies used.

Technology	Confidence	Category
Envoy	100	Reverse proxies
Google Cloud	100	IaaS
Fly.io	100	PaaS
reCAPTCHA	100	Security
HSTS	100	Security
Google Cloud CDN	100	CDN
Cloudflare	100	CDN
HTTP/3	100	Miscellaneous

Data collected using Third Party Web 0.24.0

Utility
Other Google APIs/SDKs
Sentry
Survelliance
Other Google APIs/SDKs
Google CDN
Google Tag Manager
Google Analytics
Google Fonts
Cdn
Google CDN
JSDelivr CDN
Unpkg
jQuery CDN
Google Fonts
Tag-manager
Google Tag Manager
Analytics
Google Analytics

Data from run 3

Visual Metrics

Browser Metrics

Largest Contentful Paint

When in time the page main content is rendered (collected using the Largest Contentful Paint API). Read more about Largest Contentful Paint.

Element type	P
Element/tag	<p></p>
Render time	2.843 s
Elements that needed recalculate style before LCP	192
Time spent in recalculate style before LCP	14.479 ms
Load time	0 ms
Size (width*height)	24565
DOM path
div#app-container > div#body-template-container > div > div#footer-container > div > div > footer > div > div:eq(0) > div:eq(0) > p:eq(1)> div#app-container > div#body-template-container > div > div#footer-container > div > div > footer > div > div:eq(0) > div:eq(0) > p:eq(1)>

The largest contentful paint is highlighted in the image. If no element is highlighted the element was removed before the screenshot or the LCP API couldn't find the element.

Detected Cumulative Layout Shift

0.64734 cumulative layout shift collected from the Cumulative Layout Shift API.

These HTML elements contribute most to the Cumulative Layout Shifts of the page. The higher score, the more layout shift.

Score	HTML Element
0.46226	<div id="footer-container"></div>,<div id="darkSwitch" class="darkmode-toggle" title="Turn on dark mode"></div>
body > div#app-container > div#body-template-container > div > div#footer-container,body > div#darkSwitch
0.08359	<div id="content-container"></div>
body > div#app-container > div#body-template-container > div > div#content-container
0.07853	<div id="footer-container"></div>
body > div#app-container > div#body-template-container > div > div#footer-container
0.00854	<div class="facet__pagination-container"></div>,<div class="facet__container"></div>,<div class="facet__container"></div>,<div class="facet__container"></div>,<div class="facet__container"></div>
body > div#app-container > div#body-template-container > div > div#content-container > div > div > div#results-page-layout > div:eq(3) > div#dynamic-page-body > div > div > div#results-left-column > div > div:eq(0) > div > div > div > div:eq(1) > div:eq(1),body > div#app-container > div#body-template-container > div > div#content-container > div > div > div#results-page-layout > div:eq(3) > div#dynamic-page-body > div > div > div#results-left-column > div > div:eq(1) > div > div,body > div#app-container > div#body-template-container > div > div#content-container > div > div > div#results-page-layout > div:eq(3) > div#dynamic-page-body > div > div > div#results-left-column > div > div:eq(2) > div > div,body > div#app-container > div#body-template-container > div > div#content-container > div > div > div#results-page-layout > div:eq(3) > div#dynamic-page-body > div > div > div#results-left-column > div > div:eq(3) > div > div,body > div#app-container > div#body-template-container > div > div#content-container > div > div > div#results-page-layout > div:eq(3) > div#dynamic-page-body > div > div > div#results-left-column > div > div:eq(4) > div > div
0.00792	<div class="__footer_brand"></div>,<div class="__footer_list"></div>,<div class="__footer_list"></div>,
body > div#app-container > div#body-template-container > div > div#footer-container > div > div > footer > div > div:eq(0),body > div#app-container > div#body-template-container > div > div#footer-container > div > div > footer > div > div:eq(1),body > div#app-container > div#body-template-container > div > div#footer-container > div > div > footer > div > div:eq(3),body > div#app-container > div#body-template-container > div > div#footer-container > div > div > footer > div > div:eq(2) > ul > li:eq(1) > a > #text:eq(1)
0.00254	<div class="logo2"></div>,<div class="__footer_brand_disclaimer"></div>
body > div#app-container > div#body-template-container > div > div#footer-container > div > div > footer > div > div:eq(0) > div:eq(1) > div:eq(1),body > div#app-container > div#body-template-container > div > div#footer-container > div > div > footer > div > div:eq(0) > div:eq(2)
0.00206	<div class="facet__container"></div>,<div class="facet__container"></div>,<div class="facet__container"></div>,<div class="facet__container"></div>,<div class="facet__container"></div>
body > div#app-container > div#body-template-container > div > div#content-container > div > div > div#results-page-layout > div:eq(3) > div#dynamic-page-body > div > div > div#results-left-column > div > div:eq(5) > div > div,body > div#app-container > div#body-template-container > div > div#content-container > div > div > div#results-page-layout > div:eq(3) > div#dynamic-page-body > div > div > div#results-left-column > div > div:eq(1) > div > div,body > div#app-container > div#body-template-container > div > div#content-container > div > div > div#results-page-layout > div:eq(3) > div#dynamic-page-body > div > div > div#results-left-column > div > div:eq(2) > div > div,body > div#app-container > div#body-template-container > div > div#content-container > div > div > div#results-page-layout > div:eq(3) > div#dynamic-page-body > div > div > div#results-left-column > div > div:eq(3) > div > div,body > div#app-container > div#body-template-container > div > div#content-container > div > div > div#results-page-layout > div:eq(3) > div#dynamic-page-body > div > div > div#results-left-column > div > div:eq(4) > div > div
0.00151
0.00040	<div class="facet__pagination-container"></div>,<div class="facet__container"></div>,<div class="facet__container"></div>,<div class="facet__container"></div>,<div class="facet__container"></div>
body > div#app-container > div#body-template-container > div > div#content-container > div > div > div#results-page-layout > div:eq(3) > div#dynamic-page-body > div > div > div#results-left-column > div > div:eq(2) > div > div > div > div:eq(1) > div:eq(1),body > div#app-container > div#body-template-container > div > div#content-container > div > div > div#results-page-layout > div:eq(3) > div#dynamic-page-body > div > div > div#results-left-column > div > div:eq(3) > div > div,body > div#app-container > div#body-template-container > div > div#content-container > div > div > div#results-page-layout > div:eq(3) > div#dynamic-page-body > div > div > div#results-left-column > div > div:eq(4) > div > div,body > div#app-container > div#body-template-container > div > div#content-container > div > div > div#results-page-layout > div:eq(3) > div#dynamic-page-body > div > div > div#results-left-column > div > div:eq(5) > div > div,body > div#app-container > div#body-template-container > div > div#content-container > div > div > div#results-page-layout > div:eq(3) > div#dynamic-page-body > div > div > div#results-left-column > div > div:eq(6) > div > div

The elements that have shifted place is highlighted in the image (that have a higher value than 0.01). If the element shifted outside of the viewport, you will not see it there. It can be hard to understand what content that has shifted, if that's the case, checkout the video or the filmstrip of the run.

Long Animation Frames

Read more about the Long Animation Frames API here here.

The top 10 longest animation frames entries

Server timings

There are no Server Timings.

Custom metrics collected through JavaScript

There are no custom configured scripts.

Extra metrics collected using scripting

There are no custom extra metrics from scripting.

PageXray

How the page is built.

Largest assets on the page (by transfer size)

Requests and sizes per content type

Data per domain

Expires and last modified statistics

Requests loaded after onLoad event

Included requests done after load event end.

Requests loaded after onContentLoad

Includes requests done after DOM content loaded.

Render blocking requests

Render blocking information directly from Chrome.

Render information

CPU

Download the Chrome trace log and drag and drop it into Developer Tools / Performance in Chrome.

Long Tasks

Collected using the Long Task API. A long task is a task that take 50 milliseconds or more.

CPU last long task happened at 4.214 s

Individual Long Tasks

CPU time spent

Calculated using Tracium.

Time spent per request

CPU time spent

Third party

Third party requests categorised by Third party web version 0.24.0.

Third party requests and tools

First party requests and sizes per content type

Calculated using .*harvard.* (use --firstParty to configure).

Third party requests and sizes per content type